No signup. No paywall. No catch.One of our 10 most-requested practitioner modules — published in full so anyone can learn for free. We earn through consulting, not by gating knowledge.
Defence in depth is a phrase. Multi-layer validation is its application. Client-side validation catches user mistakes. Edge validation (WAF) catches bulk attacks. Server-side validation enforces business rules. Database constraints catch the rest. Each catches what the others miss.
Defence in depth is a phrase. Multi-layer validation is its application. Client-side validation catches user mistakes. Edge validation (WAF) catches bulk attacks. Server-side validation enforces business rules. Database constraints catch the rest. Each catches what the others miss. Skip a layer = bypass that layer’s coverage entirely.
The mistake: assuming “the WAF catches it” or “the server validates” — when each layer has different visibility. WAF doesn’t see post-decoding payload. Server validation may miss what the framework deserialised. Each layer is a checkpoint, not a backstop.
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